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This weird-named database appears in 10.2.9 (not released yet) when we compile rocksdb according to https://mysqlnlinux.blogspot.com/2017/05/how-to-install-myrocks-into-mariadb-as.html
I could not find any way to remove it. It causes errors when I do a select over schema tables. There is no directory with that name in the data directory.Also this version crashes when you try to set bulk-upload mode, and the table and data does not conform to the rules. It should never crash.